From 2a81499f7cf878503408c55a3d91f2bc97a05afa Mon Sep 17 00:00:00 2001
From: Djeeberjr <djeeberjr@gmail.com>
Date: Mon, 29 Sep 2025 16:20:08 +0200
Subject: [PATCH] added pm3 write script & already used ids

---
 em4100_write.lua | 61 +++++++++++++++++++++++++++++++++
 used_ids.txt     | 88 ++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 149 insertions(+)
 create mode 100644 em4100_write.lua
 create mode 100644 used_ids.txt

diff --git a/em4100_write.lua b/em4100_write.lua
new file mode 100644
index 0000000..2683e1a
--- /dev/null
+++ b/em4100_write.lua
@@ -0,0 +1,61 @@
+local used_ids = {}
+local id_file_path = "used_ids.txt"
+
+local function load_ids()
+  local file = io.open(id_file_path, "r")
+  if not file then return end
+  for line in file:lines() do
+    used_ids[line:lower()] = true
+  end
+  file:close()
+end
+
+local function save_id(id)
+  local file = io.open(id_file_path, "a")
+  if file then
+    file:write(id:lower() .. "\n")
+    file:close()
+  end
+end
+
+local function gen_id()
+  local id = ""
+  for i = 1, 10 do
+    id = id .. string.format("%x", math.random(0, 15))
+  end
+  return id
+end
+
+local function get_new_id()
+  local tries = 0
+  while tries < 10000 do
+    local id = gen_id()
+    if not used_ids[id:lower()] then
+      return id
+    end
+    tries = tries + 1
+  end
+  error("Could not generate a new unused ID after 10000 tries")
+end
+
+local function write_new_card()
+  local id = get_new_id()
+  local cmd = string.format("lf em 410x clone --id %s", id)
+  core.console(cmd)
+  used_ids[id:lower()] = true
+  save_id(id)
+  print("Wrote new EM4100 card with ID:", id)
+end
+
+local function write_new_card(id)
+  local cmd = string.format("lf em 410x clone --id %s", id)
+  core.console(cmd)
+  used_ids[id:lower()] = true
+  save_id(id)
+  print("Wrote new EM4100 card with ID:", id)
+end
+
+math.randomseed(os.time())
+load_ids()
+local id = get_new_id()
+write_new_card(id)
diff --git a/used_ids.txt b/used_ids.txt
new file mode 100644
index 0000000..848e2aa
--- /dev/null
+++ b/used_ids.txt
@@ -0,0 +1,88 @@
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